Sofa



FIG. 1 is a front perspective view of the sofa showing my design;

FIG. 2 is a side view of the sofa showing my design, the other side being identical therewith;

FIG. 3 is a front view of the sofa showing my design;

FIG. 4 is a back view of the sofa showing my design;

FIG. 5 is a top view of the sofa showing my design; and

FIG. 6 is a bottom view of the sofa showing my design.

In FIGS. 2-6 the cushions have been omitted for convenience of illustration. 

The ornamental design for a sofa, as shown and described. 